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2. A sample of 60 night school students had an average age of 25.3 years. Use...
A sample of 67 night-school students' ages is obtained in order to estimate the mean age...
A sample of 67 night-school students' ages is obtained in order to estimate the mean age of night-school students. = 26 years. The population variance is 20. (a) Give a point estimate for u. (Give your answer correct to one decimal place.) (b) Find the 95% confidence interval for u. (Give your answer correct to two decimal places.) Lower Limit Upper Limit (c) Find the 99% confidence interval for u. (Give your answer correct to two decimal places.) Lower Limit...
What is the average age of students who live off campus? A random sample of 51...
What is the average age of students who live off campus? A random sample of 51 students shows the mean of 21.7 years and the standard deviation 2.5 years. Use a 95% level of confidence. a. What is the population parameter to estimate? b. What is the sample statistic? c. Find a 95% confidence interval for population parameter. d. Interpret your interval in the context. e. Melinda assumes that students who live off campus, on average, are older than 25....
A researcher surveys middle-school students on their study habits. She finds that in a random sample...
A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school students, the mean amount of time that they spend working on the computer each night is 2.4 hours with a standard deviation of 0.92 hours. She uses the sample statistics to compute a 95% confidence interval for the population mean - the the mean amount of time that all middle-school students spend working on the computer each night. What is the...
random sample of 64 students at a university showed an average age of 25 years and...
random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2 years. The 95% confidence interval for the true average age of all students in the university is ____________ Select one: a. 24.5 to 25.4 b. 20.5 to 29.5. c. 23.0 to 27.0 d. 20.0 to 30.0
A researcher surveys middle-school students on their study habits. She finds that in a random sample...
A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school students, the mean amount of time that they spend working on the computer each night is 2.4 hours with a standard deviation of 0.92 hours. She uses the sample statistics to compute a 95% confidence interval for the population mean - the the mean amount of time that all middle-school students spend working on the computer each night. What is the...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school typed an average of 85 words per minute with a standard deviation of 8 words per minute. Assume that the number of words typed per minute of a randomly selected graduates follows a normal distribution 1. (4 pts) a 95% confidence interval to estimate the average number of words typed by all graduates of this school. Remember to state the assumptions and interpret the...
A random sample of 65 high school students has a normal distribution. The sample mean average...
A random sample of 65 high school students has a normal distribution. The sample mean average ACT exam score was 21.4 with a 3.2 sample standard deviation. Construct a 90% confidence interval estimate of the population mean average ACT exam.
Average Sleep Time on a School Night Students 4 hours 8 5 hours 9 6 hours...
Average Sleep Time on a School Night Students 4 hours 8 5 hours 9 6 hours 14 7 hours 12 8 hours 15 9 hours 4 10 hours 0 Ho: 72.7% of high school students (grade 9-12) do not get enough sleep at night. (minimum 8 hours) Ha: 72.7% of high school students (grade 9-12) do get enough sleep at night. Sample size: Sample mean: Sample deviation: Record the hypothesis test. Use 5% level of significance Include 95% confidence interval...
Question:The average cost per night of a hotel room in New York City is $472. Assume...
Question:The average cost per night of a hotel room in New York City is $472. Assume this estimate is based on a sample of 75 hotels and that the sample standard deviation is $54. a. At 90% confidence, what is the interval estimate for the population mean? b. At 95% confidence, what is the interval estimate for the population mean? c. At 99% confidence, what is the interval estimate for the population mean? d. Describe the effect of a higher...
1. (19 pt) A sample of 25 individuals from a normally distributed population reported a sample me...
1. (19 pt) A sample of 25 individuals from a normally distributed population reported a sample mean of 6.86 hours of sleep per night and a sample standard deviation of 0.78. (Make sure to show all work.) a. What is the 90%,confidenceinterval estimate for the population mean? b. What is the 95% confidence interval estimate for the population mean? c. What is the 99% confidence interval estimate for the population mean? d. A sample taken the previous year had a...
A sample of 67 night-school students' ages is obtained in order to estimate the mean age of night-school students. = 26 years. The population variance is 20. (a) Give a point estimate for u. (Give your answer correct to one decimal place.) (b) Find the 95% confidence interval for u. (Give your answer correct to two decimal places.) Lower Limit Upper Limit (c) Find the 99% confidence interval for u. (Give your answer correct to two decimal places.) Lower Limit...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school typed an average of 85 words per minute with a standard deviation of 8 words per minute. Assume that the number of words typed per minute of a randomly selected graduates follows a normal distribution 1. (4 pts) a 95% confidence interval to estimate the average number of words typed by all graduates of this school. Remember to state the assumptions and interpret the...
1. (19 pt) A sample of 25 individuals from a normally distributed population reported a sample mean of 6.86 hours of sleep per night and a sample standard deviation of 0.78. (Make sure to show all work.) a. What is the 90%,confidenceinterval estimate for the population mean? b. What is the 95% confidence interval estimate for the population mean? c. What is the 99% confidence interval estimate for the population mean? d. A sample taken the previous year had a...
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